Ken:
I had a hand-held DMM, back around 1992, which did something close to that. IIRC, it was made by Beckman (which later sold that division to Fluke). It had the ability to create a tone whose frequency was proportional to whatever function and range you had selected. I found it very helpful in tracking down cable shield problems because you could set it for a resistance measurement and then walk around some big system shaking cables and structure pieces while listening to the tone. Setting it for DCV and connecting it to the video output on an EMC receiver would give me an audible indication of RF signal strength. Unfortunately, it was only proportional and you couldn't set an alarm or trip point. Seems like in these days of microprocessors everywhere, somebody ought to have a DMM option that has high/low limit set-points and even speaks to you. If any DMM you have has an output of some sort (like the ancient Simpsons VOM's had), you could build a simple oscillator and comparator into a small box and use that connected to that "monitor" output of your DMM. Ed Price WB6WSN Chula Vista, CA USA From: Ken Javor [mailto:ken.ja...@emccompliance.com] Sent: Monday, May 30, 2016 10:58 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Handheld or portable voltmeter/ammeter with built-in and adjustable limit function with audible alarm Ken & Dieter, Thank you, but none of those really met my criteria. I'm looking for a piece of stand-alone test equipment, a multimeter, where I can set a limit and have the thing generate an audible tone (like during continuity testing) if the preset level is exceeded (or if a measured value is below the preset minimum). Datalogging is not of interest - what I need is a real-time alarm which I don't have to visually monitor. It just seems like this should exist, and would be extremely valuable for a test facility to have available, custom configurable for a wide variety of thresholds. Ken Javor Phone: (256) 650-5261 _____ From: Ken Wyatt <k...@emc-seminars.com> Reply-To: Ken Wyatt <k...@emc-seminars.com> Date: Mon, 30 May 2016 10:12:47 -0600 To: <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Handheld or portable voltmeter/ammeter with built-in and adjustable limit function with audible alarm Maybe one of these could work. http://www.poweringthenetwork.com/site-power-monitor/ https://www.gavazzionline.com/pdf/DIB71CB.eng.pdf https://www.microdaq.com/data-loggers/voltage-current.php www.westell.com/document/ <http://www.westell.com/document/dc-power-monitoring/?dl=1> dc-power-monitoring/?dl=1 <http://www.westell.com/document/dc-power-monitoring/?dl=1> <http://www.westell.com/document/dc-power-monitoring/?dl=1> _______________________ I'm here to help you succeed! Feel free to call or email with any questions related to EMC or EMI troubleshooting - at no obligation. I'm always happy to help! Kenneth Wyatt Wyatt Technical Services LLC 56 Aspen Dr. Woodland Park, CO 80863 Phone: (719) 310-5418 Email Me! <mailto:k...@emc-seminars.com> <mailto:k...@emc-seminars.com> | Web Site <http://www.emc-seminars.com> <http://www.emc-seminars.com> | Blog <http://design-4-emc.com/> <http://design-4-emc.com/> The EMC Blog (EDN) <http://www.edn.com/blog/The-EMC-Blog> <http://www.edn.com/blog/The-EMC-Blog> Subscribe to Newsletter <http://www.emc-seminars.com/Newsletter/Newsletter.html> <http://www.emc-seminars.com/Newsletter/Newsletter.html> Connect with me on LinkedIn <http://www.linkedin.com/in/kennethwyatt> <http://www.linkedin.com/in/kennethwyatt> On May 30, 2016, at 9:56 AM, Ken Javor <ken.ja...@emccompliance.com> wrote: Handheld or portable voltmeter/ammeter with built-in and adjustable limit function with audible alarm For an EMI test, I need to monitor direct current and set a limit above which I get an audible alarm. I don't want to constantly have to watch an ammeter/voltmeter while also operating the susceptibility equipment. I also don't want to have to connect a DVM to a PC; I want the limit setting function to be self-contained. Seems as if there ought to be such a device, but I can't find it. Doesn't have to be an ammeter per se; if it can measure dc millivolts, I can use a current shunt. Thank you, Ken Javor Phone: (256) 650-5261 - - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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